JEE PHYSICS MCQ: GRAVITATION

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Understanding +4 | -1

A point mass

m

is placed at a distance

2 R

from the centre of the shell of mass

M

and radius

R

. The gravitational force exerted by shell on the point mass is

View answer and explanation

Correct option: B

\frac{G M m}{4 R^2}

Option B (

\frac{G M m}{4 R^2}

) is correct because the gravitational force exerted by a spherical shell on a point mass outside the shell is the same as if all the mass of the shell were concentrated at its center.

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The escape velocity for a body projected vertically upwards from the surface of the earth is

11.2\mathrm{\;\;km}{\mathrm{s}^{ - 1}}

. If the body is projected in a direction making an angle of

{45^0}

with the vertical, the escape velocity will be The escape velocity of a body projected from the surface of earth is

v_e

. If the body is projected at an angle

\theta

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